Turn Elasticsearch SQL page in Explore & Analyze into an overview of Elasticsearch SQL usage in Kibana

Follow up 2/2 to https://github.com/elastic/docs-content/issues/2563

[The current page](https://www.elastic.co/docs/explore-analyze/query-filter/languages/sql) doesn't bring much value as compared to the [its counterpart in the reference section](https://www.elastic.co/docs/reference/query-languages/sql).

As part of the effort to bring Explore & Analyze closer to Kibana, we should update this page to list the difference usage of this language that we can make throughout Kibana, similar to [the ES|QL page](https://www.elastic.co/docs/explore-analyze/query-filter/languages/esql-kibana). I didn't find a place in the docs where we say how SQL can be useful as a language when using Kibana